To prepare filling: Melt chocolate, stirring until smooth. Cool.
In a large bowl, beat together cream cheese and sugar until fluffy. Beat in melted chocolate, corn syrup and vanilla until blended. Add egg and egg yolks. Beat until completely incorporated.

To prepare topping: In a large bowl, beat together all topping ingredients. Spoon over batter and spread gently to cover. Bake for 20 minutes. Cool completely on wire rack. Refrigerate for at least 4 hours.